Stefano Fantoni

E-mail

 fantoni (at) sissa.it

Office

 A 406

Web

Tel

 +39 040 3787 421

Fax

 +39 040 3787 249

Vita

Research

  • Many-body methods: important developments have been made in the Auxiliary Field Diffusion Monte Carlo, which is now considered as the most powerful Quantum Monte Carlo for simulation of large nuclear systems both in normal and superfluid phase. Correlated Basis Function Theory has been extended to treat the superfluid phase of ncutron matter.
  • Nuclear Physics: Detailed nuclear matter calculations at high density has proved the inadequacy of modern nuclear interactions.
  • Astronuclear physics: Ab initio calculations have been performed for the matter in the core of neutron star. AFDMC calculations have been performed for the spin susceptibility of neutron matter, of relevance for the mean free path of neutrinos in the nuclear medium, and therefore for the mechanism of supernovae explosion and the cooling of neutron stars. It has been found that NN correlations reduce of a facto 3 the spin susceptibility. The gap of the BCS phase of neutron matter has been calculated with AFDMC and CBF methods, which agree to a large extent. Previous estimates based on mean field theories have been proven to be inadequate.
  • Cold atomic gas: Lattice Bose Gas has been studied. Important effects have been found of random on-site energy on the critical temperature

Future directions:

  • nuclear physics: developments of two-body density dependent nuclear potentials based upon chiral perturbation theory
  • many-body methods: development of FHNC theory for independent correlated pair correlation ansatz
  • astronuclear physics:  study of the matter in the crust of neutron stars
  • cold atomic gas: Ginzburg-Landau description of a layered attractive Hubbard model; CBF calculations of the BCS-BEC transition of cold fermionic atoms

Publications

  1. Gandolfi, S; Illarionov, AY ; Fantoni, S; Miller, JC ; Pederiva, F; Schmidt, KE Quantum Monte Carlo calculation of the equation of state of neutron matter, PHYSICAL REVIEW C, 79 (5)
  2. Gandolfi, S; Illarionov, AY; Pederiva, F; Schmidt, KE and Fantoni, S Equation of state of low-density neutron matter, and the S-1(0) pairing gap, PHYSICAL REVIEW C, 80 (4), 045802 OCT 2009;
  3. Gandolfi, S; Illarionov, AY; Schmidt, KE; Pederiva, F and Fantoni, S, Quantum Monte Carlo calculation of the equation of state of neutron matter, PHYSICAL REVIEW C, 79 (5), 054005 MAY 2009;
  4. Dell’Anna, L; Fantoni, S; Sodano, P; Trombettoni, A, Effect of random on-site energies on the critical temperature of a lattice Bose gas, LASER PHYSICS, 19 (4): 571-577;
  5. Dell’Anna, L; Fantoni, S; Sodano, P; Trombettoni, A, Critical temperature of non-interacting Bose gases on disordered lattices, JSTAT, Art. No. P11012 NOV 2008;
  6. Gandolfi, S; Illarionov, AY ; Fantoni, S; Pederiva, F; Schmidt, KE, Equation of state of superfluid neutron matter and the calculation of the S-1(0) pairing gap, PHYSICAL REVIEW LETTERS, 101 (13): Art. No. 132501 SEP 26 2008;
  7. Fabrocini, A; Fantoni, S ; Illarionov, AY ; Schmidt, KE, S-pairing in neutron matter: I. Correlated basis function theory, NUCLEAR PHYSICS A, 803 (3-4): 137-158 MAY 1 2008;
  8. Gandolfi, S; Pederiva, F; Fantoni, S; Schmidt, KE , Auxiliary field diffusion Monte Carlo calculation of nuclei with A <= 40 with tensor interactions, PHYSICAL REVIEW LETTERS, 99 (2): Art. No. 022507 JUL 13 2007;
  9. Gandolfi, S; Pederiva, F ; Fantoni, S; Schmidt, KE, Quantum Monte Carlo calculations of symmetric nuclear matter, PHYSICAL REVIEW LETTERS, 98 (10): Art. No. 102503 MAR 9 2007;
  10. Navarro, J ; Fantoni, S; Guardiola, R ; Zuker, A, Stability and spectra of small He-3-He-4 clusters, INT. JOURNAL OF MODERN PHYSICS B, 20 (30-31): 5071-5080 Sp. Iss. SI DEC 20 2006;
  11. Benhar, O; Fabrocini, A ; Fantoni, S; Lykasov, GI, Neutrino opacity in cold neutron matter, PHYSICS OF ATOMIC NUCLEI, 69 (11): 1962-1966 NOV 2006;
  12. Gandolfi, S; Pederiva, F; Fantoni, S; Schmidt, KE, Auxiliary field diffusion Monte Carlo calculation of properties of oxygen isotopes, PHYSICAL REVIEW C, 73 (4): Art. No. 044304 APR 2006;